Keyless Access System (Keyless Access Control Unit, Electric Steering Lock, And TPMS Control Unit) (2016 2017 2018)

NOTE: 

• Before testing, check for DTCs. If any DTCs are indicated, troubleshoot those DTCs first.
• If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Refer to:

  Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks .

• Before testing, make sure the No. A6 (10 A), No. A25 (20 A)*, and the No. A26 (10 A) fuses in the under-hood fuse/relay box are OK.
• Before testing, make sure the No. B1-3 (60 A), No. B1-5 (30 A), No. 1-6 (30 A) and the No. B10 (10 A) fuses in the auxiliary under-hood fuse/relay box are OK.
• Before testing, make sure the No. C3 (7.5 A) fuse in the under-dash fuse/relay box is OK.
• Some models have the rear outer handle touch sensor. Perform the troubleshooting flow where applicable.

*: Without auto idle stop system

1. Turn the vehicle to the OFF (LOCK) mode.

2. Disconnect the keyless access/TPMS control unit connectors.

NOTE:  All connector views are shown from the wire side of the female terminals.

Courtesy of HONDA, U.S.A., INC.

3. Inspect the connectors and socket terminals to be sure they are all making good contact:

• If the terminals are bent, loose, or corroded, repair them as necessary, and recheck the system.
• If the terminals look OK, go to step 4.

4. With the connectors still disconnected, do the following input tests:

• If any test indicates a problem, find and correct the cause, then recheck the system.
• If all the input tests prove OK, then go to step 5.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
C4	LT BLU	Under all conditions	Check for continuity between terminal C4 and data link connector (DLC) terminal No. 7:   There should be continuity	An open or high resistance in the K-LINE wire
			Check for continuity between terminal C4 and body ground:   There should be no continuity.	A short to ground in the K-LINE wire
C6	ORN	Under all conditions	Check for continuity between terminal C6 and data link connector (DLC) terminal No. 15:   There should be continuity.	An open or high resistance in the L-LINE wire
			Check for continuity between terminal C6 and body ground:   There should be no continuity.	A short to ground in the L-LINE wire
B10	BLK	Press the engine start/stop switch button	Measure the voltage to ground:   There should be battery voltage.	Blown No. C3 (7.5 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box Faulty engine start/stop switch An open or high resistance in the wire
B11	BRN	Press the engine start/stop switch button	Check for continuity to ground:   There should be continuity.	Faulty keyless access/TPMS control unit Faulty engine start/stop switch An open or high resistance in the wire
C5	LT GRN	Jump the SCS line with the HDS, disconnect PCM connector A (51P)	Check for continuity between terminal under-dash fuse/relay box connector F (18P) terminal No. 17 and PCM connector A (51P) terminal No. 38:   There should be continuity.	An open in the S-NET wire PCM
		Disconnect the under-dash fuse/relay box connector M (12P)	Check for continuity between terminal C5 and under-dash fuse/relay box connector M (12P) terminal No. 8:   There should be continuity.	An open in the S-NET wire Faulty under-dash fuse/relay box
			Check for continuity between terminal C5 and body ground:   There should be no continuity.	A short to ground in the S-NET wire

5. Reconnect the connectors, and do the following input tests:

• If any test indicates a problem, find and correct the cause, then recheck the system.
• If all the input tests prove OK, then go to step 6.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
A1	RED	Under all conditions	Measure the voltage to ground:   There should be battery voltage.	Blown No. C3 (7.5 A) fuse in the under-dash fuse/relay box Blown No. B1-3 (60 A) fuse in the auxiliary under-hood fuse/relay box Faulty under-dash fuse/relay box An open or high resistance in the wire
B18	WHT	Under all conditions	Measure the voltage to ground:   There should be battery voltage.	Blown No. A26 (10 A) fuse in the under-hood fuse/relay box Faulty under-hood fuse/relay box An open or high resistance in the wire
A17	BLK	In all power modes	Measure the voltage to ground:   There should be less than 0.2 V.	Poor ground (G405) An open or high resistance in the ground wire
B36	BLK	In all power modes	Measure the voltage to ground:   There should be less than 0.2 V.	Poor ground (G405) An open or high resistance in the ground wire
B30	YEL	Vehicle ON mode	Measure the voltage to ground:   There should be battery voltage.	Blown No. C24 (7.5 A) fuse in the under-dash fuse box Blown No. B1-5 (30 A) fuse in the auxiliary under-hood fuse/relay box Faulty under-dash fuse/relay box Faulty IG1A relay An open or high resistance in the wire
B34	TAN	Vehicle ON mode	Measure the voltage to ground:   There should be battery voltage.	Blown No. B1-5 (30 A) fuse in the auxiliary under-hood fuse/relay box Blown No. C9 (7.5 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box Faulty IG1B relay An open or high resistance in the wire
B29	RED	Vehicle ON mode	Measure the voltage to ground:   There should be battery voltage.	Blown No. B1-6 (30 A) fuse in the auxiliary under-hood fuse/relay box Blown No. C39 (7.5 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box Faulty IG1B relay An open or high resistance in the wire
B27	TAN	Vehicle ON mode	Measure the voltage to ground:   There should be battery voltage.	Blown No. B10 (10 A) fuse in the auxiliary under-hood fuse/relay box Faulty under-dash fuse/relay box An open or high resistance in the wire
C14*4	WHT	Driver's door outer handle lock button pushed	Measure the voltage to ground   :There should be less than 0.2 V.	Faulty driver's door outer handle Poor ground (G401) or an open in the ground wire An open or high resistance in the wire
		Driver's door outer handle lock button released	Measure the voltage to ground:   There should be about 5 V.	Faulty driver's door outer handle A short to ground in the wire
C13*4	BLU	Front passenger's door outer handle lock button pushed	Measure the voltage to ground:   There should be less than 0.2 V.	Faulty front passenger's door outer handle Poor ground (G405) or an open in the ground wire An open or high resistance in the wire
		Front passenger's door outer handle lock button released	Measure the voltage to ground:   There should be about 5 V.	Faulty front passenger's door outer handle A short to ground in the wire
B1	YEL	Parking brake pedal pressed	Measure the voltage to ground:   There should be less than 0.2 V.	Faulty parking brake switch Faulty parking brake switch ground An open or high resistance in the wire
		Parking brake pedal released	Measure the voltage to ground:   There should be about 5 V.	Faulty parking brake switch A short to ground in the wire
C16	YEL	Tailgate outer handle switch pushed	Measure the voltage to ground:   There should be less than 0.2 V.	Faulty tailgate outer handle switch Faulty power tailgate control unit*5 Poor ground (G604) or an open in the ground wire*6 An open or high resistance in the wire
		Tailgate outer handle switch released	Measure the voltage to ground:   There should be about 5 V.	Faulty tailgate outer handle switch A short to ground in the wire
C10	BLU	Shift lever in P position	Measure the voltage to ground:   There should be less than 0.2 V.	Faulty transmission range switch*1, TCM *2 Poor ground (G101) or an open in the ground wire An open or high resistance in the wire
		Shift lever in any position other than P	Measure the voltage to ground:   There should be about 5 V.	Faulty transmission range switch*1, TCM*2 A short to ground in the wire
C9*1	GRN	Shift lever in P position	Measure the voltage to ground:   There should be about 5 V.	Faulty park pin switch A short to ground in the wire
		Shift lever in any position other than P	Measure the voltage to ground   :There should be less than 0.2 V.	Faulty park pin switch Poor ground (G405) or an open in the ground wire An open or high resistance in the wire
B3*3	LT GRN	Electric steering lock (LOCK)	Measure the voltage to ground:   There should be about 5 V.	Faulty electric steering lock A short to ground in the wire
		Electric steering lock (UNLOCK)	Measure the voltage to ground:   There should be less than 0.2 V.	Faulty electric steering lock An open or high resistance in the wire

*1: 6-speed A/T

*2: 9-speed A/T

*3: With electric steering lock

*4: With keyless access function

*5: With keyless access function and with power tailgate

*6: With keyless access function and without power tailgate

Electric Steering Lock 

NOTE: 

• SRS components are located in this area. Review the SRS component locations - Refer to:

  SRS Component Location Index (2016) or

  Component Location Index (2017 2018 2019 2020 2021) and the

  Precautions and Procedures before doing repairs or service.

• Before testing, make sure the No. C3 (7.5 A) and No. C9 (7.5 A) fuses in the under-dash fuse/relay box are OK.
• Before testing, check for DTCs. If any DTCs are indicated, troubleshoot those DTCs first.

6. Turn the vehicle to the OFF (LOCK) mode.

7. Disconnect the electric steering lock 12P connector.

Courtesy of HONDA, U.S.A., INC.

8. Inspect the connector and socket terminals to be sure they are all making good contact:

• If the terminals are bent, loose, or corroded, repair them as necessary, and recheck the system.
• If the terminals look OK, then go to step 9.

9. Reconnect the connector, and do the following input tests:

• If any test indicates a problem, find and correct the cause, then recheck the system.
• If all the input tests prove OK, go to step 10.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
3	RED	Under all conditions	Measure the voltage to ground:   There should be battery voltage.	Blown No. C3 (7.5 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box An open or high resistance in the wire
12	TAN	Vehicle ON mode	Measure the voltage to ground:   There should be battery voltage.	Blown No. C9 (7.5 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box An open or high resistance in the wire
7	BLK	In all power modes	Measure the voltage to ground:   There should be less than 0.2 V.	Poor ground (G401) An open or high resistance in the ground wire
8	LT GRN	Electric steering lock (LOCK)	Measure the voltage to ground:   There should be about 5 V.	Faulty keyless access/TPMS control unit A short to ground in the wire An open or high resistance in the wire
		Electric steering lock (UNLOCK)	Measure the voltage to ground:   There should be less than 0.2 V.	Faulty electric steering lock
5	PNK	Vehicle ON mode	Measure the voltage to ground:   There should be battery voltage.	Faulty keyless access/TPMS control unit An open or high resistance in the wire A short to ground in the wire

10. If multiple failures are found on more than one control unit, replace the Keyless Access/TPMS Control Unit - Removal and Installation . If input failures are related to a particular control unit, replace the control unit.